The cathedral was finished by the westernmost bay of its nave, its capacious porch, and the southwest tower, under Bishop Étienne de Nemours (1188-1222), who had three brothers, also bishops and builders, at Paris, at Meaux, and at Châlons, the sons, all four of them, of a lord chancellor of France. In Noyon, Bishop Étienne was a sound administrator; he was favorable to the municipality, regulated the town's moneys, and built a hospital. Philippe-Auguste sent him to Denmark to escort to France the unfortunate Princess Ingeborg, who was to be his second wife. The bishop was buried as a benefactor in the abbey of Ourscamp, four miles from Noyon, farther down the Oise, which house was a foundation of Bishop Simon de Vermandois, though only vestiges of its XII-century parts remain.[46] During the last decade of the XIII century a terrible fire raged for two days in Noyon Cathedral. The vaulting throughout the church, save in the choir aisle, had to be reconstructed. For the sexpartite system, which embraces two bays, and has six branches from the keystone of each vault section, was now substituted the barlong plan, where diagonals cover one bay. The early-Gothic architects took up with enthusiasm the Normans' sexpartite plan, but after using it for half a century they most sensibly returned to the quadripartite system as better suited to their needs. The sexpartite vault calls for piers of alternating strength, since on the heavier pier fall diagonals and transverse arch, and only a transverse arch on the intermediate pier. Noyon Cathedral had from its start planned for a sexpartite vault by building its ground supports of alternating strength. Its piers, therefore, became illogical when a barlong vaulting was erected after the fire of 1193. And one regrets that it has not its original stone roof, since the correlations in this hardy first cathedral are elsewhere very perfect. Throughout the church are details of subtle charm. There is a slight bending out, like a horseshoe, of the archivolts of the pier arcade, which archivolts are severely plain. Usually from the abacus of a main pier rise five clustered shafts to the level of the vault-springing, two to catch the diagonals, two for the longitudinal or wall arches, and one for the transverse arch. Noyon showed constructive agility in concentrating its wall ribs and diagonals on a single shaft, which meant only three clustered colonnettes from main piers to vault-springing.